Myopia correction uses: MCQ with Answer and Explanation

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Myopia correction uses:

A. Bifocal lens

B. Cylindrical lens

C. Convex lens

D. Concave lens

Answer: Option D

Solution (By JKExamLibrary)

Myopia (nearsightedness): far point reduced; corrected by concave (diverging) lens to shift image to retina. Hypermetropia uses convex lens. Memory tip: 'Myopia = near-sighted ⇒ concave lens; Hyper = far-sighted ⇒ convex'. Vision defect correction frequently tested in competitive exams to assess application knowledge.

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Question #1

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In a step-up transformer, the primary coil has

A. More turns and thicker wire

B. Fewer turns and thicker wire

C. Fewer turns and thinner wire

D. More turns and thinner wire

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Correct Answer: Option B

Explanation:
Step-up: Ns > Np. Primary fewer turns, thicker wire because current higher on primary side (for step-up, Vp < Vs, Ip > Is).

This question belongs to: Science Physics

Question #2

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Spring-mass period in orbiting satellite:

A. Infinite

B. Depends on orbit

C. Zero

D. Same as Earth

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Correct Answer: Option D

Explanation:
T = 2π√(m/k): depends on mass and spring constant only, not gravity. Weightlessness doesn't affect spring force. Memory aid: 'Spring period: independent of g; pendulum period: depends on g'. Oscillations concept frequently tested in competitive exams.

This question belongs to: Science Physics